Measurements, errors, and negative kinetic energy

Yakir Aharonov, Sandu Popescu, Daniel Rohrlich, Lev Vaidman

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


An analaysis of errors in measurement yields insight into the penetration of quantum particles into classically forbidden regions. In addition to physical values, realistic measurements yield unphysical values which, we show, can form a consistent pattern. An experiment to isolate a particle in a classically forbidden region obtains negative values for its kinetic energy. These values realize the concept of a weak value, discussed in previous works.

Original languageEnglish
Pages (from-to)4084-4090
Number of pages7
JournalPhysical Review A
Issue number6
StatePublished - 1 Jan 1993
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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